std::regex_constants::syntax_option_type

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Defined in header `<regex.h>`

typedef /unspecified/ syntax_option_type; static constexpr icase = /unspecified/; static constexpr nosubs = /unspecified/; static constexpr optimize = /unspecified/; static constexpr collate = /unspecified/; static constexpr ECMAScript = /unspecified/; static constexpr basic = /unspecified/; static constexpr extended = /unspecified/; static constexpr awk = /unspecified/; static constexpr grep = /unspecified/; static constexpr egrep = /unspecified/;

The syntax_option_type is a type that contains options that govern how regular expressions behave.


Value	Effect(s)

`icase`	Character matching should be performed without regard to case.

`nosubs`	When performing matches, no sub-expression matches should be stored in the supplied std::regex_match structure.

`optimize`	Instructs the regular expression engine to make matching faster, with the potential cost of making construction slower. For example, this might mean converting a non-deterministic FSA to a deterministic FSA.

`collate`	Character ranges of the form "[a-b]" will be locale sensitive.

`ECMAScript`	Use a modified version of the ECMAScript regular expression grammar (ECMA-262). ECMA-262 is also known as JavaScript and is effectively the same as Perl5.

`basic`	Use the basic POSIX regular expression grammar (grammar documentation).

`extended`	Use the extended POSIX regular expression grammar (grammar documentation).

`awk`	Use the regular expression grammar used by the awk utility in POSIX (grammar documentation)

`grep`	Use the regular expression grammar used by the grep utility in POSIX.

`egrep`	Use the regular expression grammar used by the grep utility, with the -E option, in POSIX.